The correct answer is B. The FileNet integration that provides a schema and easy-to-understand query language is the Content Services GraphQL API. This API enables callers to create, retrieve, update, or delete resources, and provides a schema and query language system that simplifies application development for Content Platform Engine. GraphQL is particularly useful for web and mobile application development because clients can retrieve exactly the data they need in a single call, reducing over-fetching and simplifying front-end development. Traditional web services, Java APIs, and .NET APIs remain valid integration mechanisms for FileNet and Content Engine, but they do not match the specific schema and query language description. The Content Services GraphQL API's schema is also aligned closely to the Content Engine object model, while exposing it in a more developer-friendly GraphQL form. Reference/topics: FileNet Content Manager, Content Platform Engine, Content Services GraphQL API, schema, query language, CRUD operations, web/mobile integration.